# how many ways could you

• Feb 25th 2008, 12:51 PM
sweetkendra
how many ways could you
Having a bit of trouble here:

There are 7 seals and 8 dolphins entered in an aquatic obedience show. How many ways could you select a final group to judge if it must consist of 3 seals and 3 dolphins? How many ways could you award first, second and third place winners?

I am not sure if you have to subtract three from each one on the first question or what? Really stuck.
• Feb 25th 2008, 01:48 PM
galactus
Quote:

There are 7 seals and 8 dolphins entered in an aquatic obedience show. How many ways could you select a final group to judge if it must consist of 3 seals and 3 dolphins
You must choose 3 seals from 7 and 3 dolphins from 8.

C(7,3)*C(8,3)
• Feb 25th 2008, 02:31 PM
sweetkendra
Thank you
Thank you for your help. What about the second part of the question or is it done the same way?
• Feb 25th 2008, 03:15 PM
Plato
Quote:

Originally Posted by sweetkendra
What about the second part of the question or is it done the same way?

Kendra,
Do you plan to do any of your own work?
Can you at least make some effort?
If so, show us your work.
• Feb 25th 2008, 05:10 PM
mr fantastic
Quote:

Originally Posted by sweetkendra
Having a bit of trouble here:

There are 7 seals and 8 dolphins entered in an aquatic obedience show. How many ways could you select a final group to judge if it must consist of 3 seals and 3 dolphins? How many ways could you award first, second and third place winners?

I am not sure if you have to subtract three from each one on the first question or what? Really stuck.

Are the places being awarded to the six sea creaures chosen?

Use the pigeon hole principle to get the number of ways of arranging six objects among three prizes ...... (6)(5)(4) = 120.